Reference Design · Point-source 2-way
Penn PointSource Dual-8 WG
MTM dual 8″ + 1.4″ compression on 90°×60° waveguide · Ported
A symmetric MTM point source built around two 8″ mid-bass drivers and a 1.4″ compression driver on a 90°×60° constant-directivity waveguide. Engineered for a single coherent point of origin — for small-venue PA, install front-fill, and studio mains.
Specifications
Engineered, then verified.
Every figure on this page traces to this cabinet’s design data in the Penn Audio Speaker Lab, where it’s modeled as a complete system and verified before production.
| Configuration | Two-way passive MTM point source, vented bass reflex (front slot port) |
|---|---|
| Frequency response (target) | 60 Hz – 18 kHz |
| Cabinet tuning Fb | 50 Hz |
| Sensitivity | 100 dB SPL on-axis (design target) |
| Maximum SPL | 124 dB @ 1 m (design target) |
| Power handling | 500 W (design target) |
| Nominal impedance | 4.0 Ω |
| LF transducers | 2 × 8″ woofers |
| HF transducer | 1 × 1.4″ compression driver |
| Crossover | LR4 @ 1.8 kHz |
| Coverage | 90° H × 60° V (constant-directivity waveguide) |
| Enclosure | Braced plywood, vented |
| Dimensions (W × H × D) | 260 × 800 × 370 mm |
Inside the design
Why it’s built this way.
True point source
The two woofers sit symmetrically about the waveguide axis, keeping the vertical lobing pattern symmetric and the acoustic origin coherent — so the system images as a single point rather than three drivers.
Waveguide-loaded HF
A 90°×60° constant-directivity waveguide adds sensitivity, lets the compression driver cross in cleanly at the low end of its range, and matches the woofers' directivity by the time they begin to beam.
Coherent crossover
An LR4 acoustic alignment puts the woofers well down before their cone breakup and hands the baton to the HF with 0° relative phase on-axis at the crossover — the two sections sum flat where it counts.
Penn Audio
Hear the PointSource Dual-8 WG on your system.
Book a demo, or download the full datasheet.